Hello Vadim and Di~An,
Thank you very much. Yes, my ultimate goal is to have the new hierarchy created which groups the dimensions accordingly. I am at the mercy of our company gurus on this point 
And I do need to learn much more about how to create custom formulas etc. in BPC. My knowledge is still very basic.
My solution was to use VBA Code to Copy>PasteValues>Add for each member until I achieved the "group sum" I needed. It is not elegant and it takes a while to run, but, it works for now!
Thanks again!
/Lisa